package com.keshihao.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.keshihao.eduservice.entity.EduSubject;
import com.keshihao.eduservice.entity.excel.SubjectData;
import com.keshihao.eduservice.service.EduSubjectService;
import com.keshihao.servicebase.exceptionhandler.TechException;

/**
 * @author Mr.Ke
 * @create 2020-05-22-20:40
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    // 因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    // 不能实现数据库操作
    public EduSubjectService subjectService;

    public SubjectExcelListener() { }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    // 读取excel内容，一行一行添加到数据库
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {

           if (subjectData == null) {
               throw new TechException(20001,"文件数据为空");
           }

           // 一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
           // 判断一级分类是否重复
           EduSubject eduSubject = this.existOneSubject(subjectService,subjectData.getOneSubjectName());
           if (eduSubject == null) {
               // 没有相同一级分类，进行添加
               eduSubject = new EduSubject();
               eduSubject.setParentId("0");
               eduSubject.setTitle(subjectData.getOneSubjectName());
               subjectService.save(eduSubject);
           }

           // 二级分类
           // 判断二级分类是否重复
           EduSubject twoSubject = this.existTwoSubject(subjectService,subjectData.getTwoSubjectName(),eduSubject.getId());
           if (twoSubject == null) {
                // 没有相同二级分类，进行添加
               twoSubject = new EduSubject();
               twoSubject.setParentId(eduSubject.getId());
               twoSubject.setTitle(subjectData.getTwoSubjectName());
               subjectService.save(twoSubject);
        }

    }

    // 判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService,String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject one = subjectService.getOne(wrapper);
        return one;
    }

    // 判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject two = subjectService.getOne(wrapper);
        return two;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
